How To Fix SDDL_PARSER_MSG521 - Upper limit of cardinality can be 1 or "*"

SAP Error Message - Details

• Message type: E = Error

• Message class: SDDL_PARSER_MSG - Message Class for DDL Parser

• Message number: 521

• Message text: Upper limit of cardinality can be 1 or "*"

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SDDL_PARSER_MSG521 - Upper limit of cardinality can be 1 or "*" ?

  The SAP error message SDDL_PARSER_MSG521 indicates an issue related to the cardinality definition in the context of SAP's Service Data Language (SDL) or similar data modeling scenarios. This error typically arises when defining relationships between entities in a data model, where the cardinality specifies how many instances of one entity can be associated with instances of another entity.
  Cause:
  The error message suggests that the upper limit of cardinality is incorrectly defined. In SAP data modeling, cardinality can be defined as:
  
  1: Indicates that there can be exactly one instance of the entity.
  *: Indicates that there can be zero or more instances of the entity.
  
  If the upper limit of cardinality is set to a value other than 1 or *, the system will throw this error.
  Solution:
  To resolve this error, you should:
  
  Review the Cardinality Definition: Check the definition of the relationship in your data model. Ensure that the upper limit of cardinality is set to either 1 or *.
  Modify the Cardinality: If you find that the cardinality is set to an invalid value, change it to either 1 or * as per your business requirements.
  Validate the Model: After making changes, validate the data model to ensure that there are no other issues.
  
  Related Information:
  
  Cardinality in Data Modeling: Understanding cardinality is crucial in data modeling as it defines the nature of relationships between entities. Familiarize yourself with concepts like one-to-one, one-to-many, and many-to-many relationships.
  SAP Documentation: Refer to SAP's official documentation or help resources for detailed guidelines on defining cardinality and relationships in your specific SAP environment.
  Testing: After making changes, conduct thorough testing to ensure that the data model behaves as expected and that the error does not recur.
  
  If you continue to experience issues after following these steps, consider reaching out to your SAP support team or consulting with a specialist who has experience with SAP data modeling.